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Spectral characteristics of sensors onboard IRS-1D and P6 satellites: Estimation and their influence on surface reflectance and NDVI

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Abstract

This paper reports the results of a modeling study carried out with two objectives, (1) to estimate and compare effective spectral characteristics (central wavelength, bandwidth and bandpass exo-atmospheric solar irradiance Eo) of various spectral channels of LISS-III, WiFS, LISS-III*, LISS-IV and AWiFS onboard Indian Remote Sensing Satellites IRS-ID and P6 using moment method based on the laboratory measurements of sensor spectral response, and (2) to quantify the influence of varying sensor spectral response on reflectance and Normalized Difference Vegetation Index (NDVI) measurements using surface reflectance spectra corresponding to different leaf area index conditions of crop target obtained through field experiment. Significant deviation of 4 to 14 nm in central wavelength and 1.6 to 14.07 nm in spectral width was observed for the corresponding channel of IRS sensors. Coefficient of variation of the order of 0.1 to 1.11% was noticed in Eo among various IRS sensors, which could induce a difference of 0.72 to 3.35% in the estimation of top of atmosphere reflectance for crop target. The variation in spectral response of IRS sensors implied a relative difference of the order of 0.91 to 3.38% in surface reflectance and NDVI measurements. Polynomial approximations are also provided for spectral correction that can be utilized for normalizing the artifacts introduced due to differences in spectral characteristics among IRS sensors.

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Author notes

  1. V. K. Dadhwal

    Present address: Indian Institute of Remote Sensing, 248 001, Dehradun, India

Authors and Affiliations

  1. Indian Space Research Organization, Space Applications Centre, 380 015, Ahmedabad, India

    M. R. Pandya, R. P. Singh, K. N. Chaudhari, K. R. Murali, A. S. Kirankumar & J. S. Parihar

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  1. M. R. Pandya
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  2. R. P. Singh
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  3. K. N. Chaudhari
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  4. K. R. Murali
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  5. A. S. Kirankumar
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  6. V. K. Dadhwal
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  7. J. S. Parihar
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Correspondence to M. R. Pandya.

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Pandya, M.R., Singh, R.P., Chaudhari, K.N. et al. Spectral characteristics of sensors onboard IRS-1D and P6 satellites: Estimation and their influence on surface reflectance and NDVI. J Indian Soc Remote Sens 35, 333–350 (2007). https://doi.org/10.1007/BF02990789

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  • DOI: https://doi.org/10.1007/BF02990789

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